Hojo T
Department of Anatomy and Anthropology, University of Occupational and Environmental Health, School of Medicine, Kitakyushu City, Japan.
Scanning Microsc. 1992 Sep;6(3):785-9; discussion 790.
This is a description of microwear and striae of Retzius of canine teeth of wild-caught female Japanese monkeys (Macaca fuscata) from Oita Takasakiyama, Kyushu. Micrographs were taken of high resolution casts using a scanning electron microscope (SEM). Before the casts were made, the diet of the captive monkeys was water-softened for three or four days. This softened diet probably added little wear to the surfaces of the teeth. These animals are part of a sample used in a previous report published in this journal. Others have observed that wild Japanese monkeys eat hard foods (such as grasshoppers, cicads etc.) in the summer season. They also bite the hard bark of trees in order to obtain soft parts of buds in the winter season. The author previously reported that the wild female Japanese monkeys from Oita Takasakiyama showed many thick striations and large pits on the occlusal surfaces of the second mandibular molars, and noted that these microfeatures categorized these samples in the group of hard-object feeders as defined by Teaford. In this study canine teeth are examined. Three were heavily worn, exposing patterns related to the structure of the enamel. Two canines had prism relief on the heavily worn surfaces. Some of the relief seem to be related to the striae of Retzius. These features may be ascribed to excessive grinding (bruxism). These findings are presented as direct evidence of the effect feeding behavior has on the canine teeth of wild Japanese monkeys.
这是对来自九州大分高坂山的野生雌性日本猕猴（猕猴属fuscata）犬齿的微磨损和芮氏线的描述。使用扫描电子显微镜（SEM）拍摄了高分辨率铸型的显微照片。在制作铸型之前，将圈养猴子的食物用水软化三到四天。这种软化的食物可能对牙齿表面几乎没有磨损。这些动物是该期刊先前发表的一份报告中所使用样本的一部分。其他人观察到，野生日本猕猴在夏季食用硬食物（如蚱蜢、蝉等）。它们在冬季也会咬坚硬的树皮以获取芽的柔软部分。作者先前报道，来自大分高坂山的野生雌性日本猕猴在下颌第二磨牙的咬合面上显示出许多粗大的条纹和大坑，并指出这些微观特征将这些样本归类为Teaford所定义的硬食物进食者组。在本研究中，对犬齿进行了检查。三颗犬齿磨损严重，露出了与釉质结构相关的图案。两颗犬齿在严重磨损的表面有棱柱凸起。一些凸起似乎与芮氏线有关。这些特征可能归因于过度研磨（磨牙症）。这些发现作为进食行为对野生日本猕猴犬齿影响的直接证据呈现出来。
